部分弱电解质的电离平衡常数如下表:
下列说法不正确的是
弱电解质 | HCOOH | HCN | H2CO3 | NH3·H2O |
电离平衡常数 (25 ℃) | Ka=1.8×10-4 | Ka=4.9×10-10 | Ka1=4.3×10-7 Ka2=5.6×10-11 | Kb=1.8×10-5 |
下列说法不正确的是
A.结合H+的能力:![]() ![]() |
B.0.1mol/L的HCOONH4溶液中:c(HCOO-)>c(![]() |
C.25 ℃时,pH=3的盐酸与pH=11的氨水混合,若溶液显中性,则二者消耗的体积是:V(盐酸)>V(氨水) |
D.0.1mol/L的NaHCO3溶液中:c(Na+)+ c(H+)=c(![]() ![]() |
更新时间:2015-05-11 17:09:57
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【推荐1】已知
℃时,
溶液的
,
的HA溶液中
,则
的HA溶液中水电离出的
为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b19ccd792a028a48f5ade76450a97b8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dcc29a9648b2fae5cb1ae7a1c7091d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cfd7bdf4228be7fdd5e712d429fba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1018abc5cadd8d4f91732ed10f945f04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6cfd7bdf4228be7fdd5e712d429fba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4f1b0cd194d8a0296869dad2aa4d24b.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐1】室温下,下列溶液中粒子浓度大小关系正确的是
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/a0eeeaa6-ad9a-426a-9c4a-640db3083e8c.png?resizew=229)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/a0eeeaa6-ad9a-426a-9c4a-640db3083e8c.png?resizew=229)
A.0.1mol/LNaHCO3溶液与0.1mol/LNaOH溶液等体积混合,所得溶液中:c(Na+)>c(CO![]() ![]() |
B.pH相同的①CH3COONa②NaHCO3③NaAlO2三份溶液中的c(Na+):②>③>① |
C.0.1mol•L-1的硫化钠溶液中:c(OH-)=c(H+)+c(HS-)+c(H2S) |
D.上图中a点溶液中各离子浓度的关系是:c(OH-)=c(H+)+c(CH3COO-)+2c(CH3COOH) |
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【推荐2】常温下,向0.1mol•L-1的乙二胺(H2NCH2CH2NH2)溶液中不断通入HCl气体,溶液中三种含氮微粒的物质的量分数δ与pOH的关系图如图。已知:①乙二胺为无色液体,有类似氨的性质,常温下Kb1=10-4.07,Kb2=10-7.15;②假设溶液体积保持不变。下列说法中不正确 的是{已知:pOH=-lgc(OH-)}
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/ab541112-3e15-4625-b3dd-1fc6258399e7.png?resizew=288)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/ab541112-3e15-4625-b3dd-1fc6258399e7.png?resizew=288)
A.曲线Ⅱ代表的微粒符号为H2NCH2CH2NH![]() |
B.b点的对应pOH=5.61 |
C.pOH=a时,c(Cl-)>0.05mol•L-1 |
D.在0.1mol•L-1H2NCH2CH2NH3Cl溶液中:c([H2NCH2CH2NH3]+)>c([H3NCH2CH2NH3]2+)>c(H2NCH2CH2NH2) |
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【推荐3】电位滴定法(potentiometric titration)是在滴定过程中通过测量电位变化以确定滴定终点的方法,当电极电位(ERC)产生了突跃,被测离子浓度产生突跃,进而确定滴定终点。向10mL 0.1
溶液(
为二元弱酸)中逐滴滴加0.1
二元酸
溶液,第一个电位突跃时消耗a mL
溶液,第二个电位突跃时又消耗b mL
溶液,根据消耗
溶液体积,可判断
和
各级电离常数大小关系。下列说法错误的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4d9129b79ac985bc46c88b092aeb02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f6c356f9926054bb1e502d79424d19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17865f8dddb369e8e0b1e6d1de6f6c1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c4d9129b79ac985bc46c88b092aeb02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4406269e0cec4d409637dfd15611ce6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4406269e0cec4d409637dfd15611ce6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4406269e0cec4d409637dfd15611ce6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4406269e0cec4d409637dfd15611ce6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17865f8dddb369e8e0b1e6d1de6f6c1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4406269e0cec4d409637dfd15611ce6e.png)
A.若a=5mL、b=5mL,![]() |
B.若a=5mL、b=15mL,则![]() |
C.若a=5mL、b=15mL,第一个电位突跃时,溶液中:![]() |
D.若a=10mL、b=10mL,则用0.1![]() ![]() ![]() ![]() |
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【推荐1】已知常温下水溶液中
的分布分数
[如
表示
的分布分数]随
变化曲线如图1;溶液中
和
关系如图2。用
溶液滴定
溶液,下列说法错误的是
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/eb3078a6-91bb-44cb-a64e-ea501e352076.png?resizew=542)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae43757f0ae0c6230a4f551a4c47490.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed7f8cbdb8ba13f9a6aa30d5033d55d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd236fe135c8cdb174ef2873587febf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1066e53bf79a3cdff7ec2934bd09e272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0100e6cb92e0413cbe4d14b1d60737a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b412c4248fc1f5a2f6604ff0a509aff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d4eca7ba9b311dfbb8b58a66e346738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2a22cb01ab8677c13f49e36dcb75944.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/eb3078a6-91bb-44cb-a64e-ea501e352076.png?resizew=542)
A.曲线a表示![]() |
B.酸性:![]() |
C.滴定过程中溶液会有![]() ![]() |
D.滴定过程中始终存在:![]() |
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【推荐2】常温下,向
溶液中逐滴滴入NaOH溶液并恢复至常温,溶液中
、
、
、
的分布比例如图(忽略溶液体积的变化)。已知常温下
,
,
。下列说法错误的是
![](https://img.xkw.com/dksih/QBM/2022/4/7/2952918654107648/2953574147514368/STEM/ad84276d-70f5-4982-8f18-2fbc71609060.png?resizew=388)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef9ae53faa8131162e2b4d640a9b7bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ec42431044eb85982aefc8f0ec7175.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efb21c1262459d071283fc896d91d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af5533a64f801adeabf53d192906e951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52db9e787c515500701f6f34344a595b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a32124a77b393a794623ba5665be8a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d403e721bf4a97753e84256e5c38cef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a55c3d4c99d92c6c43241cc321d0db7.png)
![](https://img.xkw.com/dksih/QBM/2022/4/7/2952918654107648/2953574147514368/STEM/ad84276d-70f5-4982-8f18-2fbc71609060.png?resizew=388)
A.曲线m表示的是![]() |
B.![]() ![]() ![]() |
C.溶液中任意一点存在:![]() |
D.X点溶液中:![]() |
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